EXCLUSIVE: Paul Haggis is circling The Last Of The Tribe, a fact-based jungle thriller scripted by Mark Bailey, who co-wrote the Oscar nominated documentary Last Days In Vietnam. Here, he adapted The Last of the Tribe: The Epic Quest to Save a Lone Man in the Amazon, by Washington Post reporter Monte Reel. The film is based on a compelling true story: It's estimated that more than 40 undiscovered indigenous tribes make their home in the Brazilian Amazon.